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Title: Rearing, storing, and efficacy studies on arzama densa for release programs against waterhyacinth
Authors: Southern Weed Science Laboratory (U.S.)
United States. Army. Corps of Engineers. New Orleans District.
Aquatic Plant Control Research Program (U.S.)
Baer, R. G.
Quimby, P. C. (Paul C.)
Keywords: Aquatic plant control
Aquatic plants
Laboratory tests
Biological control
Publisher: Environmental Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Description: Technical Report
Abstract: This research was conducted to develop mass rearing and dispersal techniques for large-scale releases of Arzama densa as a biological agent for the management of waterhyacinth. Life history information on A. densa was obtained from field observations of natural populations and from laboratory studies. Various artificial diets and insect storage techniques were tested for rearing and synchronizing life stages of A. densa in release programs. Methods were tested that might be used to release A. densa on an operational scale. Various densities of A. densa larvae were evaluated for efficacy against waterhyacinth in outdoor pools. The life history studies showed that natural enemies greatly reduce field populations of A. densa. Augmentation would likely be more effective in July/August or spring when parasite/predator populations are low. Nine consecutive laboratory generations of A. densa were successfully reared on an artificial diet that included a water extract of waterhyacinth. Storage of larvae at 8°C permitted synchronization of releases with little mortality. It was found that larvae can be successfully dispersed in segments of waterhyacinth petioles, but this method is labor-intensive. Arzama densa at a rate of one third instar larva/two plants successfully controlled waterhyacinth in artificial pools.
Appears in Collections:Technical Report

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